We emphasize the following points: • SPS and terrestrial solar power plants have similar nominal power per square meter of land occupation (SPS 40W/m2, solar power plants 40 to 80 W/m^). Domestic photovoltaic cells are 2 to 2.5 times better. • Concerning annual energy. SPS is 2 to 6 times greater than terrestrial power plants but only 1.1 to 2.6 better than decentralized photovoltaics. Nevertheless, an important point is that SPS is able to deliver base load electricity for 8000 hours a year, which is not directly achievable with thermodynamics or ground-based photovoltaics. These last require either thermal or electrical storage, or contribution of other fuels. Finally it is important to notice that photovoltaic power plants and the reference concept SPS are roughly suitable for latitudes between 45°N and 45°S. On the other hand the favorable areas for thermodynamic plants are situated between 10° and 40° North or South. Scenario NOE 2100 solar mix The NOE scenario requires 2350 Mtoe of solar energy in 2100 including thermal and electrical applications. Table IV shows a preliminary breakdown of different technologies: thermal applications, wind electricity, decentralized solar electricity, centralized electricity (power plants and SPS). Thermal applications: we have supposed that each house is equipped with area of solar thermal collectors of 0.5 m^ to 1 m^ per inhabitant, in relation to the local energy productivity (from 4 to 8 10"^ toc/m^/year).
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